Pattern-plate



E- F. MCTIGHE.

PATTERN PLATE.

l D JUNI-I3. 1920. Y

Patented Feb. 22, 1921.

H UH

Tuning/4g,

UNITED STATES PATENT OFFICE.

EDWARD F. Mc'rIGHE, or BRTDGEPOR'LCONNECTICUT, AssIGNoR 'ro THE BAssIcK co.,

OF BRIDGEPORT, CONNECTICUT, A CORPORATION OF CONNECTICUT.

PATTERN-PLATE.

Application led .Tune 3, 1920. Serial No. 386,321.

To all whom t may concern Be it known that I, EDWARD F. MCTIGHE, a citizen of the United States, residing at Bridgeport, Fairfield county, Connecticut, have invented certain new and useful Improvements in Pattern-Plates; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to certain new and useful improvements in pattern plates and pertains more especially to plate 'molds emplo ed in the casting of caster wheels.

geretofore it has been impossible to make perfect castings in a molding machine that employs plate molds for the reason that the tread or effective face of the casterwheel failed to come out true but to the contrary would have a jagged contour, this inaccuracy always appearing on the side of the caster wheel tread where the molten metal 1Tirst flowed when filling the mold.

The present invention therefore has for its primary object the provision of means which will eliminate the above objection, and to this end proposes to provide means whereby the sand will be tightly packed or wedged and also reinforced so that when the molten metal flows against same, the sand will not be washed away or otherwise dis turbed, thus resulting in a perfect casting being produced.

In the drawings Figure l, is a plan view,y in fragment, ofv

the plate;

Fig. 2, is a section on line 2-2 of Figfl; gig. 3, is a section on line 3-3 of Fig. l; an

Fig. 4, is a view similar to Fig. 2, though in fragment and showing a modified form of the invention.

In proceeding in accordance with the present invention, a metal plate l, is employed, the opposite faces of which are vprovided with the usual patterns 2, conformed to the shape which is to be imparted to the caster wheel casting.

The lateral channel branch-forming parts 3 of the pattern plate lead from the main channel forming part 4, of said plate to provide the usual runways for the metal during flowing of the latter into the mold in the packed sand provided by the caster patterns.

Specification of Letters Patent.

Patented Feb. 22, 1921.

5, and the face 6 of the pattern. For the i p urpose of wedging and packing the sand tightly the face of the ribV adjacent the tread face 6 of the pattern is inclined toward the latter. Thus upon usual ramming of the sandk the latter will be tightly packed and effectively wedged in and between the parts 5 and 6.

As depicted in F ig. 4f, of the Adrawings the rib 5', may be of true 'V-shaped formation instead of the approximately semi-circular `cross-section depicted in Fig. 2, of the drawings, so as to increase the wedging action of the sand upon ramming of the latter.

In each instance, the plate has a depression 7, or 7 in register with and corresponding to the rib 5, or 5', the depression being located on the opposite side face of the plate, consequently the meeting faces of the sand in the cope and drag will be formed with a depression 5 or 5', and a corresponding projection 7 or 7 which latter will nest in the depressions so formed in the sand. Since the depressions 7 or 7', are of wedge form, taperingtoward the bottoms of the depressions, it will be apparent that the sand rammed thereinto will also be tightly wedged and packed.` Thus upon bringing of the effective sand faces of the cope and drag together, the depressions and projections will coperate and reinforce each other and form a solid surface against which lthe flowing metal will have n0 effect as to washing or wearing same away or otherwise mar the surface of the tread whencast.

It will thus be seen that the complementary depressions and projections each being formed of sand that is tightly packed and the use of my improvement the retaining rib 5 will hold the sand close to the pattern on the plate, and the castings are,

in consequence, of superior form and true to the pattern, eliminating all shifts in casting. v 1

This invention' may, of course, be einployed in the casting or' articles other than caster wheels, where the saine defect as to shifts in the casting have heretofore existed.

That is claimedis l. In a pattern plate, a. plate having patterns on each of its opposed side faces, and having a projection on one :tace surrounding the pattern and adjacent thereto and further having a complementary depression on its opposite face, the projection and depression being i'ornied so that upon rannning of the s andsarne will be wedged into the depression and wedged between a side of the projection and the adjacent part of the adjacent pattern, the depression being formed for receiving theprojection when the mold is in casting position.

2. In a pattern plate, a plate having patterns on each of its opposed faces, and having a projection with inwardly converging side walls on one face surrounding the pattern and further having a complementary depression on its opposite face having corresponding outwardly converging side walls, whereby the sand will be wedged in and between the walls of the depression and between the side wall of the projection adjacent the pattern and the latter,

3. A pattern plate having a pattern on each side face and having a projection surrounding the pattern on one face and a complementary depression surrounding the pattern on its -opposite face whereby the sand packed in the depression will be received by the sand packed by the projection.

In testimony whereof I affix my signature in presence of two witnesses.

EDIARD F. MCTIGHE.

Witnesses C. I. SUTTON, E. V. LEE. 

